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El RNA1-1 de la pequeña bóveda no codificante actúa como un riborregulador de la autofagia
Rastislav Horos1, Magdalena Büscher1, Rozemarijn Kleinendorst1
1European Molecular Biology Laboratory, Meyerhofstrasse 1, 69117 Heidelberg, Germany.
Cell
|February 19, 2019
Resumen
Los ARN de bóveda se unen directamente al receptor de autofagia p62, regulando la autofagia selectiva. Esta interacción entre el ARN y la proteína controla la p62
Área de la Ciencia:
- Biología molecular
- Biología celular
- Biología del ARN
Sus antecedentes:
- Los ARN de bóveda (vtRNA) son pequeños ARN no codificantes con funciones moleculares poco claras.
- Los ARNv se han implicado en la resistencia a los fármacos, la apoptosis y la replicación viral.
- Los roles precisos de los ARNv en los procesos celulares siguen siendo en gran medida desconocidos.
Objetivo del estudio:
- Investigar la función molecular de los ARN de las bóvedas en la regulación celular.
- Para determinar la interacción entre los ARN de la bóveda y el receptor de autofagia p62.
- Para aclarar el mecanismo por el cual los ARNv regulan la autofagia.
Principales métodos:
- Pruebas de coinmunoprecipitación para detectar la unión con el ARNv-p62.
- Estudios de sobreexpresión y eliminación de vtRNA1-1 con el uso de LNA.
- Experimentos de hambre celular para evaluar el flujo de autofagia.
- Análisis de los mutantes p62 con alteración de la unión al ARNv.
Principales resultados:
- Los ARN de bóveda se unen directamente al receptor de autofagia secuestosoma-1 / p62 en células humanas y murinas.
- La sobreexpresión de vtRNA1-1 inhibe la autofagia dependiente de p62, mientras que el knockdown la mejora.
- El hambre celular reduce los niveles de vtRNA1-1 e induce la autofagia.
- Los mutantes p62 incapaces de unirse a los ARNv muestran un aumento de la homooligomerización y la interacción del efector autofágico.
Conclusiones:
- El vtRNA1-1 regula directamente la autofagia selectiva mediante la unión a p62 y la modulación de su oligomerización.
- Este estudio revela un nuevo mecanismo de control de la función de la proteína mediada por ARN.
- Los ARN de bóveda representan una nueva clase de reguladores para la autofagia selectiva.
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